297.14% is the change from 70 to 278
Calculation steps:
[( 278 - 70 ) ÷ 70] x 100 = 297.14%
Formula
Percentage change = [(278 - 70) / 70] x 100
Subtract the new number by the original number
278 - 70 = 208
208 ÷ 70 = 2.9714285714285715
2.9714285714285715 x 100 = 297.14%